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' TO ALL WHOM 11" MAY CONCERN:

i "15125 M. Hits RIGHT Beltran, 0F LEN'cova .NEWY'ORK, AND WILLIAM ENNIS, OF

. a enson, NEW JERSEY.

Letters Patent No. 75,881, dated March 24, 1868.,

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Beit known that r ve WRIGHT DURX-EA, of Glen Cove, in the county of. Queens, andState of New York, and WILLIAMENuIS', of Hudson, in thecounty of Hudson, and State of New Jersey, have invented a new and useful Improvement in Furnaces, of which-the fcllowi-ng is a'full, clear, and exact description, refercncebeing had to the accompanying drawing, forming part of this specification, andinwhich Figure l repreents a front elevation ofafurnacc constructed according to our improvement.

Figure-2, a longitudinal section of the same, through the line w a: in fig. 1.

Figure'S, a transverse section, taken as denoted by the line 3 y infig. 2.-

Figure, a similar section, through the line 2 z in fig. 2. 7

Similar letters of referenceindicate corresponding parts.

Our improvement relates tcifurnaces, constructed substantially as described in Letters Patent of the United States issuedvto Joseph Heindle, assignee of Ferdinand Braun, hearing date May 17, 1864, and in which a basket-grate is used in connection with a reflector above it, and the fuel, of a line or smelly-broken. character,

fed froni'above to or down either-side of t'hegrate; but in this, our improvement, made not restrict ourselves to burning fuel of any particular description, which may either be fine or coarse, bituminous coal being preferred. Our'inve'ntion consists in a combination, ivith a furnaceof such deseription, 'of a perforated reflector and air-chamber deriving its supply from the exterio ondwhereby the combustion ofvthe fuel thus fed and gases generated is effected by the ordinary current from below, and partially-heated air from above to burn the carbonic oxide. Said invention also consists in a combination of close fuel-supply" chambers, separated by an intervening space or chamber, with afurnace ofthe character described. I

" Referring to the accompanying drawing, 'rl, reprcscntsthe basket-grate of the furnace, P the ash-pit, and S an ordinary fireplace-door or opening for first lighting, and it maybe, if necessary, from time to time, adjusting the fire. B is the archedreflector to or over the fire, and E the escape-outlet cr flue. D D are the'fuel-chambers for supplying with fuelin an automatic manner, by passages or openings, c, the fire, after the latter. has been Vfairlylighted and the door S closed. These chambers are of a close character, and maybe providedivith charging-doors g g. Tliey-v are thus constructed close, and kept separate' and distinct from each other to check or'prevent that general combustion of the fuel in them, andinjury to the furnace, which',.esp'ccially in the ease of bituminous coal, would or might take place were they made toform a common open receptacle. Small outlets crpassages m arcor may be made in the rear of-these ehambers'to prevent choking, and carry oil the gases generated in them to the flue or'outlet E. The space separating these chambers D D is made to constitute an airchamber, 0, supplied with air from the outside, say, by passages h'lt', in front, controlled by suitable dampers, or

V "supplied'with air in any other suitable manner. Such chamber 0 issituatcd over the arch which has 'perfor'a tions or openings 5 made in'or through it, by which means the fireis not only supplied with air from below, in

the ordinary-manner to' effect combustion of the fuel in thejgrate, but also air partially heated in the chamber G, admitted from the upper side ofv the reflector B, through it, to bugn the carbonic oxide'to the prevention of smoke, andmore perfect combustio'n 'of the fuel and inflammable gases. l A furnace thus constructed may be applied to any useful purpose for which furnaces in general are applicable.

What is here claimed, and desiredtp be secured by Letters Patent, is'

1. In a furnacc ofthe character described, and composed of a basl etgrate, A, with feed-openings for the fuel down ,either side, and reflector B, the combination .of ,a chamber, 0, supplied with air from the exterior,

and communicating with the fireplucc by openings or perforations 6 made in or through the rcllcctonlsubstantially asspecified. 4 i

t The combination of the close fucl-chambers-D D with the basket-grate A, with which they arein communication by openingsc, andseparated from eachother by an intervening space or chamber C,.essentinlly as shown and described. I I

' WRIGHT DURYEA,

WILLIAM ENNIS.

Witnesses: J

' A. Ln"C LERc,

OnasH. Asn'ron, 

